System and method for performing autonomous emergency braking

ABSTRACT

A system and method for performing autonomous emergency braking (AEB) based on peripheral situations of a vehicle are disclosed. The AEB system includes a front lateral detection sensor, a vehicle dynamics sensor, and an electronic control unit (ECU). The front lateral detection sensor detects a distance and a relative speed between a host vehicle and a peripheral object, or transmits peripheral images of the host vehicle to the ECU. The vehicle dynamics sensor detects a driving speed of the host vehicle, and transmits the detected driving speed to the ECU. The ECU receives detection signals from the front lateral detection sensor and the vehicle dynamics sensor, and increases a size of an AEB control available region and an AEB control available speed when at least one leading moving object or at least one external object is present in longitudinal and latitudinal directions of a forward region of the host vehicle and the host vehicle is unable to perform steering avoidance capable of preventing collision with the leading moving object or the external object. Accordingly, even when several leading vehicles are present not only in longitudinal and latitudinal directions of a forward region of the host vehicle and the host vehicle is unable to perform steering avoidance, the possibility of collision between the host vehicle and the leading vehicles can be reduced.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0141379, filed on Oct. 27, 2017 in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference in its entirety.

BACKGROUND 1. Field

Embodiments of the present disclosure relate to a system and method for performing autonomous emergency braking (AEB) based on peripheral situations of a vehicle, and more particularly to a system and method for performing autonomous emergency braking (AEB), which can adjust the size of an AEB control available region and an AEB control available speed by determining whether steering avoidance of the vehicle can be carried out according to peripheral situations of the vehicle, resulting in increased utility and availability of the vehicle.

2. Description of the Related Art

Generally, when a dangerous obstacle such as a leading moving object (e.g., a movable device such as a vehicle) or an external object (e.g., a moving person such as a pedestrian, or fixed installations such as precast pavers, guardrails, and curbs) is detected in a forward region of a vehicle during vehicle driving, an Autonomous Emergency Braking (AEB) system may warn a driver of a dangerous situation having a high possibility of collision when there is a high possibility of collision with the dangerous obstacle. If necessary, the AEB system performs autonomous emergency braking to prevent the vehicle from colliding with any obstacle. The AEB application fields have recently been increased and standardized, such that many developers and companies are conducting intensive research into the advanced evolved AEB system that is capable of extending utility and effectiveness in a manner that the advanced AEB system can operate in many more scenarios than the conventional AEB system, and guaranteeing higher safety and stability than the conventional AEB system in a manner that the advanced AEB system can prevent the vehicle from colliding with any obstacle.

However, the conventional AEB system has been designed to have a maximum collision avoidable speed of 60 km/h on the assumption that only one leading vehicle is present in a longitudinal direction of a forward region of a host vehicle and the host vehicle has an opportunity to perform steering avoidance capable of preventing collision with the leading vehicle. Thus, if it is impossible for the host vehicle to perform steering avoidance as shown in FIG. 4 due to not only a leading vehicle present in a longitudinal direction of a forward region of the host vehicle but also other leading vehicles present in a latitudinal direction of the forward region, the host vehicle has difficulty avoiding collision with such leading vehicles.

As a result, there is needed a new technology for allowing the AEB system to overcome legacy disadvantages in terms of utility and availability such that the AEB system can be applied to many more applications, resulting in reduction in traffic accidents.

CITED REFERENCES Patent Documents

-   -   Korean Patent Registration No. 1480610 (2015.01.02)     -   Japanese Patent Laid-Open Publication No. 2016-0124311         (2016.07.11)     -   Japanese Patent Laid-Open Publication No. 2017-0117192         (2017.06.29)

SUMMARY

Therefore, it is an aspect of the present disclosure to provide a system and method for performing autonomous emergency braking (AEB) based on peripheral situations of a host vehicle, which can determine whether the host vehicle can perform steering avoidance based on peripheral situations when not only a leading vehicle present in a longitudinal direction of a forward region of the host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are discovered, and can reduce a possibility of collision between the host vehicle and the leading vehicles by increasing the size of an AEB control available region and an AEB control available speed when the host vehicle is unable to perform steering avoidance.

Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

In accordance with an aspect of the present disclosure, a system for performing autonomous emergency braking (AEB) based on peripheral situations of a vehicle is disclosed. The AEB system includes a front lateral detection sensor, a vehicle dynamics sensor, and an electronic control unit (ECU). The front lateral detection sensor detects a distance and a relative speed between a host vehicle and a peripheral object, or transmits peripheral images of the host vehicle to the ECU. The vehicle dynamics sensor detects a driving speed of the host vehicle, and transmits the detected driving speed to the ECU. The ECU receives detection signals from the front lateral detection sensor and the vehicle dynamics sensor, and increases a size of an AEB control available region and an AEB control available speed when at least one leading moving object or at least one external object is present in longitudinal and latitudinal directions of a forward region of the host vehicle and the host vehicle is unable to perform steering avoidance capable of preventing collision with the leading moving object or the external object.

The ECU for recognizing whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object includes selecting the host vehicle, the leading moving object collidable with the host vehicle, or the external object collidable with the host vehicle to be a target vehicle to be AEB-controlled, and if the sensors determine that the leading moving object or the external object is present in front lateral directions of left and right lanes of a current lane of the host vehicle, or determine that a steering avoidance available region is not present in left/right lateral directions of the target vehicle, performing AEB control by increasing the AEB control available speed.

The ECU may include, if the sensors determine that the leading moving object or the external object is not present in the front lateral directions of the left and right lanes of the current lane of the host vehicle, or determine that the steering avoidance available region is present in the left/right lateral directions of the target vehicle, performing AEB control by maintaining the AEB control available speed.

When a driver of the host vehicle has an intention to manipulate the host vehicle, the ECU may again recognize information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object.

The information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object may be recognized through a time-to-collision (TTC) parameter indicating a total time to be consumed until two objects collide with each other.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram illustrating an autonomous emergency braking (AEB) system according to an embodiment of the present disclosure.

FIG. 2 is a flowchart illustrating an autonomous emergency braking (AEB) method according to an embodiment of the present disclosure.

FIG. 3 is a conceptual diagram illustrating an exemplary case in which not only a leading vehicle present in a longitudinal direction of a forward region of a host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are present.

FIG. 4 is a conceptual diagram illustrating information about whether the host vehicle can perform steering avoidance when not only a leading vehicle present in a longitudinal direction of a forward region of a host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are present.

DETAILED DESCRIPTION

Advantages and features of the present disclosure and a method of achieving the advantages and features of the present disclosure will be clearly understood from embodiments described hereinafter in conjunction with the accompanying drawings. However, the present disclosure is not limited to the following embodiments and may be realized in various different forms. These embodiments are provided only to completely disclose the present disclosure and for a person having ordinary skill in the art to which the present disclosure pertains to completely understand the category of the disclosure. That is, the present disclosure is defined only by the claims. The same reference numbers will be used throughout this specification to refer to the same parts.

A system and method for performing autonomous emergency braking based on peripheral situations of a vehicle according to an embodiment of the present disclosure will hereinafter be described with reference to the attached drawings.

FIG. 1 is a block diagram illustrating a system for performing autonomous emergency braking (hereinafter referred to as an AEB system) according to an embodiment of the present disclosure.

Referring to FIG. 1, the AEB system according to an embodiment of the present disclosure may include a front lateral detection sensor 10, a vehicle dynamics sensor 20, an electronic control unit (ECU) 30, a collision warning device 40, a brake control device 50, and a steering control device 60.

The front lateral detection sensor 10 may be implemented as any of various well-known sensors, such as a radar sensor, etc. At least one front lateral detection sensor 10 may be respectively installed at a center part of a front surface of a host vehicle and/or a corner part of the host vehicle, may emit a light beam within the range of a predetermined angle with respect to a front lateral region of each sensor, may receive the light beam reflected from peripheral objects located in the vicinity of the host vehicle, and may detect an angle, a distance, a relative speed, a relative acceleration, etc. between the host vehicle and each peripheral object, such that the front lateral detection sensor 10 may transmit the recognized vehicle peripheral information to the ECU 30. Alternatively, the front lateral detection sensor 10 may also be implemented as any of various well-known image sensors, for example, an FIR camera, a CMOS camera, a CCD camera, etc. The front lateral detection sensor 10 may be arranged at an upper end of a windshield of a host vehicle, may sense and project various kinds of lights within the range of a predefined angle and a predefined distance with respect to a front lateral region of the host vehicle, and may acquire an image of an external object located ahead of the host vehicle, such that the front lateral detection sensor 10 may sense a position, movement, etc. of the external object through the acquired image, and may transmit the sensed information to the ECU 30.

The vehicle dynamics sensor 20 may be implemented as any of various well-known sensors, such as a wheel sensor, etc. At least one vehicle dynamics sensor 20 may be installed at front, rear, left and right wheels of the host vehicle, such that the vehicle dynamics sensor 20 may sense a driving speed, acceleration, etc. of the host vehicle, and may transmit the sensed information to the ECU 30.

The ECU 30 may receive the signal sensed by the front lateral detection sensor 10 and the signal sensed by the vehicle dynamics sensor 20, and may determine whether the host vehicle can perform steering avoidance based on peripheral situation information (e.g., a situation in which not only a leading vehicle present in a longitudinal direction of a forward region of the host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are present). If it is impossible for the host vehicle to perform steering avoidance, the ECU 30 may increase the size of an AEB control available region while simultaneously increasing an AEB control available speed.

The collision warning device 40 may receive a control signal of the ECU 30, and may inform the driver of the host vehicle of occurrence of a high possibility of collision with any obstacle present in a forward region of the host vehicle. The brake control device 50 may receive a control signal of the ECU 30 to generate brake pressure of the host vehicle. The steering control device 60 may receive a control signal of the ECU 30 to generate a steering angle of a steering wheel of the host vehicle.

The present disclosure may provide a method for determining whether the host vehicle can perform steering avoidance based on peripheral situations (e.g., a situation in which not only a leading vehicle present in a longitudinal direction of a forward region of the host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are present), and increasing the size of an AEB control available region and the AEB control available speed of the host vehicle when the host vehicle is unable to perform steering avoidance.

A method for performing autonomous emergency braking control (hereinafter referred to as an AEB control method) by predicting a peripheral collision situation using the above-mentioned system according to the embodiment of the present disclosure will hereinafter be described with reference to FIG. 2.

Referring to FIG. 2, the ECU 30 may receive detection signals from the front lateral detection sensors 10 and the vehicle dynamics sensor 20, and may recognize whether there is a high possibility of collision between the host vehicle and any leading vehicle present in a forward region of the host vehicle (S210). If the ECU 30 determines the high possibility of collision between the host vehicle and the leading vehicles (S210), the ECU 30 may select a target vehicle to be AEB-controlled by recognizing the possibility of collision between the host vehicle and each leading vehicle (S220). In this case, a parameter indicating the possibility of collision between the host vehicle and each leading vehicle may be a time-to-collision (TTC) parameter, etc. The TTC parameter may be acquired by dividing a distance between two objects (i.e., the host vehicle and each leading vehicle) by a relative speed.

Thereafter, the ECU 30 may allow the front lateral detection sensor 10 to detect not only the presence or absence of a target vehicle that is present in a forward region of the host vehicle while simultaneously traveling in the same lane as the host vehicle, but also the presence or absence of at least one moving object present in front lateral directions of a left lane and a right lane of the current lane of the host vehicle (S230). Alternatively, the ECU 30 may allow the front lateral detection sensor 10 to detect not only the presence or absence of a target vehicle that is present in a forward region of the host vehicle while simultaneously traveling in the same lane as the host vehicle, but also the presence or absence of any external object (e.g., precast pavers, guardrails, curbs, etc.) present in front lateral directions of a left lane and a right lane of the current lane of the host vehicle (S235).

If the moving object or the external object is not detected in front lateral directions of the left and right lanes of the current lane of the host vehicle (NO in S230 and S235), the ECU 30 may perform AEB control while simultaneously maintaining a legacy AEB control available speed (e.g., 60 km/h) (S245). If the moving object or the external object is detected in front lateral directions of the left and right lanes of the current lane of the host vehicle (YES in S230 and S235), the ECU 30 may determine the presence or absence of a steering avoidable region in left/right lateral directions of the target vehicle to be AEB-controlled (selected in step S220), and may determine the presence or absence of a possibility of steering avoidance control of the host vehicle (S240).

If the presence of the possibility of steering avoidance control is decided (S240) (for example, if a moving object or an external object is present in front lateral directions of left and right lanes of a lane in which the target vehicle is traveling as shown in FIG. 4 (YES in S240)), the ECU may perform AEB control while simultaneously maintaining a legacy AEB control available speed (e.g., 60 km/h) (S245). If there is no possibility of steering avoidance control (S240) (for example, if a moving object or an external object is present in lateral directions of the target vehicle as shown in FIG. 4 (NO in S240)), the ECU 30 may control an AEB control available speed defined as a collision avoidable speed to increase from a legacy AEB control available speed (e.g., 60 km/h) up to higher speed (e.g., 90 km/h) (S250).

Thereafter, if the driver of the host vehicle has an intention to perform vehicle manipulation (e.g., manipulation of a steering wheel, an accelerator, a brake, etc.) (YES in S260), the ECU 30 may return to step S210 to again recognize the presence of the possibility of collision between the host vehicle and the leading vehicles, and may re-perform the above-mentioned steps S220 to S250 based on the recognized result. If the driver of the host vehicle has no intention to perform vehicle manipulation (e.g., manipulation of a steering wheel, an accelerator, a brake, etc.) (NO in S260), the ECU 30 may perform AEB control at a high AEB control available speed increased in step S250 (S270).

As is apparent from the above description, the system and method for performing autonomous emergency braking based on peripheral situations of a host vehicle according to the embodiments of the present disclosure can determine whether the host vehicle can perform steering avoidance based on the peripheral situations when not only a leading vehicle present in a longitudinal direction of a forward region of the host vehicle but also other leading vehicles present in a latitudinal direction of the forward region are discovered, and can reduce a possibility of collision between the host vehicle and the leading vehicles by increasing the size of an AEB control available region and an AEB control available speed when the host vehicle is unable to perform steering avoidance.

Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. 

1. An autonomous emergency braking (AEB) system comprising: a front lateral detection sensor configured to detect a distance and a relative speed between a host vehicle and a peripheral object, or transmit peripheral images of the host vehicle to an electronic control unit (ECU); a vehicle dynamics sensor configured to detect a driving speed of the host vehicle, and transmit the detected driving speed to the electronic control unit (ECU); and the electronic control unit (ECU) configured to receive detection signals from the front lateral detection sensor and the vehicle dynamics sensor, and increase a size of an AEB control available region and an AEB control available speed when at least one leading moving object or at least one external object is present in longitudinal and latitudinal directions of a forward region of the host vehicle and the host vehicle is unable to perform steering avoidance capable of preventing collision with the leading moving object or the external object.
 2. The autonomous emergency braking (AEB) system according to claim 1, wherein the electronic control unit (ECU) for recognizing whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object includes: selecting the host vehicle, the leading moving object collidable with the host vehicle, or the external object collidable with the host vehicle to be a target vehicle to be AEB-controlled; and if the sensors determine that the leading moving object or the external object is present in front lateral directions of left and right lanes of a current lane of the host vehicle, and also determine that a steering avoidance available region is not present in left/right lateral directions of the target vehicle, performing AEB control by increasing the AEB control available speed.
 3. The autonomous emergency braking (AEB) system according to claim 2, wherein the electronic control unit (ECU) includes: if the sensors determine that the leading moving object or the external object is not present in the front lateral directions of the left and right lanes of the current lane of the host vehicle, or determine that the steering avoidance available region is present in the left/right lateral directions of the target vehicle, performing AEB control by maintaining the AEB control available speed.
 4. The autonomous emergency braking (AEB) system according claim 2, wherein: when a driver of the host vehicle has an intention to manipulate the host vehicle, the electronic control unit (ECU) again recognizes information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object.
 5. The autonomous emergency braking (AEB) system according to claim 4, wherein the information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object is recognized through a time-to-collision (TTC) parameter indicating a total time to be consumed until two objects collide with each other.
 6. An autonomous emergency braking (AEB) method comprising: receiving a distance and a relative speed between a host vehicle and a peripheral object, peripheral images of the host vehicle, or a driving speed of the host vehicle from a plurality of sensors; and when information received from the sensors indicates that at least one leading moving object or at least one external object is present in longitudinal and latitudinal directions of a forward region of the host vehicle, and also indicates that the host vehicle is unable to perform steering avoidance capable of preventing collision with the leading moving object or the external object, controlling a size of an AEB control available region and an AEB control available speed to be increased.
 7. The autonomous emergency braking (AEB) method according to claim 6, wherein the controlling the size of the AEB control available region and the AEB control available speed to be increased includes: recognizing whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object includes: selecting the host vehicle, the leading moving object collidable with the host vehicle, or the external object collidable with the host vehicle to be a target vehicle to be AEB-controlled; and if the sensors determine that the leading moving object or the external object is present in front lateral directions of left and right lanes of a current lane of the host vehicle, and also determine that a steering avoidance available region is not present in left/right lateral directions of the target vehicle, performing AEB control by increasing the AEB control available speed.
 8. The autonomous emergency braking (AEB) method according to claim 7, wherein the controlling the size of the AEB control available region and the AEB control available speed to be increased includes: if the sensors determine that the leading moving object or the external object is not present in the front lateral directions of the left and right lanes of the current lane of the host vehicle, or determine that the steering avoidance available region is present in the left/right lateral directions of the target vehicle, performing AEB control by maintaining the AEB control available speed.
 9. The autonomous emergency braking (AEB) method according claim 7, further comprising: when a driver of the host vehicle has an intention to manipulate the host vehicle, again recognizing information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object.
 10. The autonomous emergency braking (AEB) method according to claim 9, wherein the information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object is recognized through a time-to-collision (TTC) parameter indicating a total time to be consumed until two objects collide with each other.
 11. The autonomous emergency braking (AEB) system according claim 3, wherein: when a driver of the host vehicle has an intention to manipulate the host vehicle, the electronic control unit (ECU) again recognizes information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object.
 12. The autonomous emergency braking (AEB) method according claim 8, further comprising: when a driver of the host vehicle has an intention to manipulate the host vehicle, again recognizing information about whether there is a possibility of collision between the host vehicle and either the leading moving object or the external object. 